Sewer Bat (Extreme)

Sewer Bat (Extreme)
Sewer Bat is a combat challenge map in Batman: Arkham Asylum.
There are two special variants, Extreme and Gutter Tactics (for the Joker DLC)
Find the Riddler Trophy for Intensive Treament Riddle #30
Extreme
Bronze - 10000 points
Silver - 30000 points
Gold - 50000 points